Allow specifying interface dns with the command 'create_host_interface'.
Thanks to Jean-Baptiste Denis for the patch.

This is a new parameter for this command. This can break old bulk updates definitions
using the wrong number of parameters.

Bugfixes

[Issue:#22]: Delete a deleted host from the hostid cache only if it
exists. If a host is created via the zabbix frontend after a
zabbix-cli session has been started, the host will not exist in the
zabbix-cli cache of this session. Thanks tohttps://github.com/volter for the report.

[Issue:#24]: Fix that a host cannot be created if the group set in
the default_hostgroup parameter does not exist. Thanks tohttps://github.com/volter for the report.

[Issue:#32]: Fix export problem when Hostgroups include the slash
character '/' e.g.: UNIX/GROUP/TEST. Thanks tohttps://github.com/invin12 for the report.

[Issue:#35]: populate_hostid_cache() excluded disabled hosts and did
not use the 'real name' attributte of the host. Fix these so we can
use the command define_host_monitoring_status in bluk
operations. Thanks to https://github.com/blu3bird for the report.